ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 527 



brief diagnosis. The name should therefore be dropped. The shell, pi. 19, 

 fig. 15 (not 16)=Chione simillima, Sby., no. 39 ; a good Lower Californian 

 species. It seems that the error was not in numbering of the figures, as 

 Mr. Nuttall supposed, but in Conrad's identification of Broderip's species]. 



40.Chione excavata [is closely related to Ch. sucdncta; the unique type, however, 

 in Brit. Mus. displays 'characteristic differences of sculpture. It is singu- 

 larly like the W. Indian Ch. cancellata, and may prove exotic]. 



^l.Cypricardia Oalifornica [C. Gumiaca, Lam.,= (7. Duperryi, Desh. Almost 

 certainly from the Sandwich Is.J. 



45, 456. Cardium Californianum \_=C. Nuttallii, var. The species is named " C, 



corbis, Mart.," by Desh. MS. in Mus. Brit, and CumingJ. 



46. Cardium quadragenarium [= C. luteolabrum, Gld.]. 

 51. v. antea, no. 32. 



56. Modiola recta. [Described from very young specimens. The broad form is 

 M.Jlabellata, Gld.] 



9. Mytilus bifurcatus. [The type is lost ; the figure and description would suit 

 many species. It is allocated, in Mus. Cum., to the Californian Sepiifer } 

 but by Pease to a Sandwich Island MytHus.~\ 



CO. [None of Conrad's species of Isogncmon have been confirmed as from Califor- 

 nia. They are known to inhabit the Pacific Islands.] 



626. [Mr. Nuttall also brought an oyster, which he named in MS. O. latecaudata, 

 = O. lurida, var. ; and Hinnites giganteus, Gray, = -f. Poulsoni, Conr.] 



64. [Dr. Gould states that H. NicUinin,na, Lea,=-ff. Calif or niensis, Pfr v Chemn., 

 Rve. ; but that H. Californiensi^ 7 Lea, is distinct.] 



69. Helix Townsendiana [=ZT. (eruginosa, Gld. MS.]. 



74. Chiton Nuttattii [is an Ischnochiton]. 



75. Chiton acutus [is an aberrant form of Mopalia. " Chiton consimilis," Nutt. MS. 



in Brit. Mus., appears to be Mopalia Hindsii, var. " Chiton Calif ornicus " 

 Nutt. MS., = " Acanthopleura" scabra, Rve.]. 



77. Patella mamillata, Nutt. [(non Esch.) is now assigned in Mus. Cuming to 

 Acmcea scabra, Nutt., var. limatula~]. 



83. Fissurella ornata, Nutt. [=-F- volcano, Rve.]. 



84. Glyphis densiclathrata, Rve. [V. anted,, p. 522. The shell has been lost.] 



86. H. Calif orniensisj Swains, [(not Californiana } V&l., = mfescens*), is an extreme 

 var. of If. Cracherodii. The series in the Smithsonian Mus. have 5, 6, 7, 

 8, and 9 holes ; as soon as it has 10 and 11, it passes into Calif orniensis, 

 which was figured in 1821 with 9 holes. When these are numerous, they 

 are generally small in proportion]. 



91. Calliostoma doliarium \_=C. canaliculatum, Mart. This and C. annulatum } 



Mart,, are quite distinct from C.Jilosum, which= C. costatum, Mart.]. 



92. Omphalms ater [is the S. American species. The common Californian shell is] 

 04. O. marginatm, Nutt. MS. [=funebralis, A. Ad.]. 



976. The collection contains one specimen of Crepidtda dorsata. 

 103. [Is a Serpidorbis, without operc., teste Cooper.] 



106. Litorina tenebrata [should be patula, Gld. (non Jeffr.). Nuttall's MS. name 



was published by Phil, in 1845]. 



107. Natica ?maroccana, var. Calif ornica. [The varietal name must be dropped. 



The shell certainly came from the Sandwich Islands.] 

 f 108. [The shell is Vitularia salebrosa, jun., and not] Ranella triquetra. 



109. Mitra maura [Swain?., teste Rve. (?ubi)=Jif. orientalis, Gray, =M. " Chi- 



lensis" Kien.]. 



110. Olivella glandinaria, Nutt. [=O. biplicata, Sby.]. 



112, 113. Purpura aperta and P. harpa [are certainly from the Sandwich Islands], 

 114. Purpura emarginata [was described by Desh. from an immature specimen in 



which a half-formed knob caused an il emargination." The adult is one 



very extreme form; P. ostrina, Gld., is another ; P. fuscata, Fbs., is a third. 



The normal condition is P. lapillus, Cooper (non Linn.),=Sfm'co/, Val. 



Mr. Nuttall's collection also contains] P. crispata, var. 



116. Monoceros brevidens [is an accidentally short-toothed form of M. lapilloides\ 

 118. Cerostoma Nuttallii [with C.foliatum and C. monoceros, Sby., belongs 



purida~]. 



